I'm not an expert by any means (having only played with WSUS a few times). I would ask if you have IIS installed on the server though? It seems to me that it's having problems with that portion. If you have IIS installed, does it have the ASP components installed?

Otherwise, I would suggest looking at Microsoft's support pages to see if there's a solution to this. Or wait for someone else who has more knowledge about WSUS to reply.

Have a great day
Patrick.